Sleeping is the rest and recharge of all body functions.(which means of all the three centres).

By the way, have you discovered your enneatype or not yet?

There are two versions of enneagram, one is spiritual and one is psychological. Forget about everything spiritual while discovering enneagram. Psychology itself is enough to understand it. If you look at the vocabulary used in enneagram: passion, fixation, defense mechanism (like reactional formation, projection...) you remark that the same words of psychology are used.

I highly, really, absolutely... recommend that you buy the book of Sandra Maitri: "The Spiritual Dimension of the Enneagram: Nine Faces of the Soul". In this book there are very detailed descriptions for each type (30 pages). The author used citations of psychologists as a support. But in the first 3 or 4 pages of each type description you find an explanation from a spiritual dimension. Leave these pages aside and do not judge enneagram based on these pages. They are not more than superstitious interpretations. But please, buy the book. It's on Amazon and it does only cost 10 dollars.